linux-kernel - Re: [RFC PATCH V3 14/21] mmc: sdhci: UHS-II support, handle vdd2 in case of power-off

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Date:   Tue, 15 Sep 2020 16:00:47 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ben Chuang <benchuanggli@...il.com>, ulf.hansson@...aro.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ben.chuang@...esyslogic.com.tw, greg.tu@...esyslogic.com.tw
Subject: Re: [RFC PATCH V3 14/21] mmc: sdhci: UHS-II support, handle vdd2 in
 case of power-off

On Fri, Aug 21, 2020 at 05:09:55PM +0300, Adrian Hunter wrote:
> On 10/07/20 2:11 pm, Ben Chuang wrote:
> > From: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > 
> > Configure a regulator for VDD2 in case of power-off.
> > 
> > Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > ---
> >  drivers/mmc/host/sdhci.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index 7f2537648a08..d38d734ec83f 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -2333,6 +2333,11 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >  		if (!IS_ERR(mmc->supply.vmmc) &&
> >  		    ios->power_mode == MMC_POWER_OFF)
> >  			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> > +		if (IS_ENABLED(CONFIG_MMC_SDHCI_UHS2) &&
> > +		    host->mmc->caps & MMC_CAP_UHS2 &&
> > +		    !IS_ERR(mmc->supply.vmmc2) &&
> > +		    ios->power_mode == MMC_POWER_OFF)
> 
> Probably this can be just:
> 
> 		if (!IS_ERR_OR_NULL(mmc->supply.vmmc2) &&
> 		    ios->power_mode == MMC_POWER_OFF)

Yeah, probably.

-Takahiro Akashi

> 
> > +			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
> >  		return;
> >  	}
> >  
> > 
>